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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old August 29th, 2016, 02:24 AM
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Default Air cleaner "Auto Therm" unit

Did any of the later V-6 GMC's use the Auto Therm valve on the air cleaner snout? Although not on a V-6, I need to replace one and since a lot of folks on this forum tend to lean toward restoration, I thought maybe someone here has done it without bending the heck out of the air cleaner snout! I know the unit can be bought at a decent price but I sure can't find how people replace them.

If this is too far from the purpose of this forum please delete.

Thanks, DAC
Attached Images
File Type: jpg Thermo 001.jpg (1.33 MB, Multiple views, 3 clicks)
File Type: jpg Thermo 002.jpg (1.14 MB, Multiple views, 1 clicks)
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1972 GMC C2500 owned since 1979
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Hope to have a '60 GMC Suburban again someday
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  #2  
Old August 29th, 2016, 02:32 AM
bigblockv6 bigblockv6 is offline
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Default Re: Air cleaner "Auto Therm" unit

Yes, 1968 and 1969 305E and 351E V6 1/2 ton trucks did have the Auto Therm unit, even the carburetors for those particular models were ported for that as well.
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  #3  
Old August 29th, 2016, 03:11 AM
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Default Re: Air cleaner "Auto Therm" unit

Quote:
Originally Posted by bigblockv6 View Post
Yes, 1968 and 1969 305E and 351E V6 1/2 ton trucks did have the Auto Therm unit, even the carburetors for those particular models were ported for that as well.
Thanks for the fast reply Pete! Do you know how to change the darn thing out without butchering up the air cleaner? I can't figure out how to bend the tab back into place once the new one is installed. I can get the tab "unbent" but you still gotta put it back together---LOL!

Thanks---DAC
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Rapid City, SD

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1972 GMC C2500 owned since 1979
1955 GMC 100 driver-project
2006 GMC Yukon Denali---wife's truck

Hope to have a '60 GMC Suburban again someday
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  #4  
Old August 29th, 2016, 03:26 AM
bigblockv6 bigblockv6 is offline
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Default Re: Air cleaner "Auto Therm" unit

It's all about bending that tab, just use a flat blat screwdriver to bend it. When you replace it use a vise grip or C clamp as long as one will fit in to hold down the unit so you can bend the tab back to it's proper position.
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  #5  
Old August 29th, 2016, 03:46 AM
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Default Re: Air cleaner "Auto Therm" unit

Quote:
Originally Posted by bigblockv6 View Post
Yes, 1968 and 1969 305E and 351E V6 1/2 ton trucks did have the Auto Therm unit, even the carburetors for those particular models were ported for that as well.
Quote:
Originally Posted by bigblockv6 View Post
It's all about bending that tab, just use a flat blat screwdriver to bend it. When you replace it use a vise grip or C clamp as long as one will fit in to hold down the unit so you can bend the tab back to it's proper position.
Ha ok that's what I was afraid of----I better go to Harbor Freight and see if I can find an oddball long-armed clamp of some sort to bend that darn tab back into position. The unit still works with a vacuum gun on my '72 GMC and it doesn't need it due to headers but even though I have owned that truck since 1979 someone had drilled a bunch of holes in the filter can part before we bought it. I'm hoping to keep the '70 air cleaner assembly on the '70. I want that valve to work though!

DAC
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Doug Crawford
Rapid City, SD

1970 GMC K5 Jimmy Mom drove 30 years
1972 GMC C2500 owned since 1979
1955 GMC 100 driver-project
2006 GMC Yukon Denali---wife's truck

Hope to have a '60 GMC Suburban again someday
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  #6  
Old August 29th, 2016, 05:15 AM
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Default Re: Air cleaner "Auto Therm" unit

Be sure to post pictures of the finished product and maybe even some of how you did it!
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  #7  
Old August 30th, 2016, 02:35 AM
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GMCDAC GMCDAC is offline
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Default Re: Air cleaner "Auto Therm" unit

Quote:
Originally Posted by TJ's GMC View Post
Be sure to post pictures of the finished product and maybe even some of how you did it!
Ok TJ I did get started on it today--Mondays are my day off, but I had other chores to do also. Since I'm on an almost non-existant budget I decided to pull the good one and swap it to the one for the '70, which gave me a little practice in removal and it came out without destroying the snout!

I had to go into town for a roll of welding wire so I stopped at Tractor Supply since it was on the way for a long reach clamp. Much closer than Harbor Freight.

I got the flat bill and the long reach locking pliers at TSC (pic1) for $9.99 in a combo deal so I wouldn't be out much if it didn't work.

Pic 2-7 show how I had to cut the clamp up to fit into the air cleaner snout and get to the position to press on the tab for installation.

Pic 8 is looking up the snout to where the clamp has to reach in pic 9.

Pic 10 is bending up the tab and bracket to remove the good one.

Please pay no attention to the engines in the pics-----
Attached Images
File Type: jpg Auto Therm 001.jpg (1.47 MB, Multiple views, 3 clicks)
File Type: jpg Auto Therm 004.jpg (1.07 MB, Multiple views, 3 clicks)
File Type: jpg Auto Therm 006.jpg (1.27 MB, Multiple views, 3 clicks)
File Type: jpg Auto Therm 008.jpg (1.08 MB, Multiple views, 3 clicks)
File Type: jpg Auto Therm 012.jpg (756.4 KB, Multiple views, 2 clicks)
File Type: jpg Auto Therm 014.jpg (999.6 KB, Multiple views, 2 clicks)
File Type: jpg Auto Therm 017.jpg (714.5 KB, Multiple views, 2 clicks)
File Type: jpg Auto Therm 002.jpg (759.5 KB, Multiple views, 2 clicks)
File Type: jpg Auto Therm 019.jpg (1.21 MB, Multiple views, 3 clicks)
File Type: jpg Auto Therm 018.jpg (807.3 KB, Multiple views, 3 clicks)
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1970 GMC K5 Jimmy Mom drove 30 years
1972 GMC C2500 owned since 1979
1955 GMC 100 driver-project
2006 GMC Yukon Denali---wife's truck

Hope to have a '60 GMC Suburban again someday

Last edited by GMCDAC; August 30th, 2016 at 02:58 AM.
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  #8  
Old August 30th, 2016, 02:49 AM
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Default Re: Air cleaner "Auto Therm" unit

Four more pics. I had to bend the retainer quite a ways to get the good one out-pic1.

The good one and the bad one-pic2.

Pic 3 and 4 show the stroke of the diaphragm from closed to open.

That's where I'm at right now. I will try to get the swap done after work tomorrow. I hope this may help anyone that wants to do this repair on their later V-6 engines.

DAC
Attached Images
File Type: jpg Auto Therm 021.jpg (899.0 KB, Multiple views, 3 clicks)
File Type: jpg Auto Therm 020.jpg (1.10 MB, Multiple views, 3 clicks)
File Type: jpg Auto Therm 022.jpg (900.2 KB, Multiple views, 3 clicks)
File Type: jpg Auto Therm 023.jpg (629.2 KB, Multiple views, 3 clicks)
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Doug Crawford
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1970 GMC K5 Jimmy Mom drove 30 years
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1955 GMC 100 driver-project
2006 GMC Yukon Denali---wife's truck

Hope to have a '60 GMC Suburban again someday
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  #9  
Old August 30th, 2016, 04:37 AM
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Default Re: Air cleaner "Auto Therm" unit

Thanks for the pictures! Wanting those for future reference for anyone who may have the same issue.
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  #10  
Old September 1st, 2016, 12:55 AM
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GMCDAC GMCDAC is offline
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Default Re: Air cleaner "Auto Therm" unit

I got the good one swapped last night. The retainer kinked a bit but I slid that thin knife blade under it and tapped on it with a plastic hammer to work that out. It was much easier to do the clamping with it secured to the engine. The clamp I built would not hit the tab right until I pulled vacuum on the valve, closing it. Then the tab pressed into shape easily.

DAC
Attached Images
File Type: jpg Auto Therm 024.jpg (1.11 MB, Multiple views, 1 clicks)
File Type: jpg Auto Therm 027.jpg (1,017.7 KB, Multiple views, 2 clicks)
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1970 GMC K5 Jimmy Mom drove 30 years
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1955 GMC 100 driver-project
2006 GMC Yukon Denali---wife's truck

Hope to have a '60 GMC Suburban again someday
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